华蟾素诱导人胃癌SGC-7901细胞凋亡

本实验旨在探讨华蟾素诱导人胃癌SGC-7901细胞凋亡的作用及其作用机制。采用不同浓度的华蟾素作用胃癌SGC-7901细胞48 h后,MTT法检测细胞活性;光学、荧光显微镜、流式细胞术检测细胞凋亡情况。Real Time RT-PCR和Western Blot分别检测Bax、Bcl-2基因m RNA和蛋白表达水平。结果显示,华蟾素对胃癌SGC-7901细胞增殖具有抑制作用且呈剂量依赖性关系,华蟾素处理7901细胞48 h的IC50值为35.67μg/m L,凋亡率为(5.01±1.69)%。显微镜下观察细胞呈明显凋亡现象,线粒体膜电位(ΔΨm)显著下降(p0.05),细胞阻滞于G1期;Bcl-2的表达下调,Bax的表达明显增加(p0.05,p0.01)。提示华蟾素可能通过上调Bax基因,下调Bcl-2基因诱导人胃癌SGC-7901细胞凋亡。     

白花蛇舌草诱导胃癌SGC-7901细胞凋亡

本研究以人胃癌SGC-7901细胞为实验对象,探讨白花蛇舌草对人胃癌SGC-7901细胞凋亡的影响。使用台盼蓝拒染法检测人胃癌SGC-7901细胞活性,通过普通光学显微镜、荧光显微镜和共聚焦显微镜,观察细胞的形态结构变化,DNA laddy检测DNA片段,Western blotting检测bax和Bcl-2基因的表达,流式细胞术检测细胞周期及线粒体膜电位。结果显示,在一定浓度范围内白花蛇舌草能抑制人胃癌SGC-7901细胞增殖,呈时间和剂量依赖性。24 h、48 h和72 h的半数抑制浓度(IC50)分别为135.886μg/m L,45.84μg/m L和42.56μg/m L。显微镜下观察到细胞皱缩、核裂变、凋亡小体、细胞核裂解、染色质形态改变等现象,DNA出现片段化,细胞阻滞于G1期,Bax蛋白表达上调、Bcl-2的蛋白表达下调。上述表明白花蛇舌草能抑制人胃癌SGC-7901细胞增殖并诱导其凋亡。     

大蒜素诱导人胃癌SGC-7901细胞凋亡

该研究探讨了大蒜素诱导人胃癌SGC-7901细胞凋亡及其作用机制。用不同浓度大蒜素作用人胃癌SGC-7901细胞48 h。通过MTT法检测细胞活性。光学、激光共聚焦显微镜下观察细胞形态变化。流式细胞术检测细胞凋亡率和细胞周期。qRT-PCR和Western blot检测Bax、Bcl-2基因和蛋白的表达水平。结果显示,大蒜素处理细胞48 h的IC50值为78μg/m L,显微镜下可观察到明显的凋亡现象,细胞凋亡率为(61.15±3.77)%,细胞阻滞于G1期,Bcl-2基因和蛋白表达均下降,Bax基因和蛋白表达均增加(P0.05)。综上所述,在一定浓度范围内,大蒜素能抑制人胃癌SGC-7901细胞增殖,诱导细胞凋亡,呈剂量依赖性,并可上调Bax基因表达,下调Bcl-2基因表达。     

原花青素诱导胃癌SGC-7901细胞凋亡及其机制的研究

为探讨原花青素对人胃癌SGC-7901细胞增殖及凋亡的影响及其可能的作用机制,以体外培养的SGC-7901细胞为研究对象,经一定浓度的原花青素作用后,用MTT法及流式细胞仪检测细胞增殖抑制及凋亡情况,Real-time PCR技术及免疫组化法检测Bcl-2、Bax mRNA和相关蛋白表达的含量。结果表明,不同浓度的原花青素不仅能有效抑制SGC-7901细胞增殖,还可诱导细胞凋亡,且抑制增殖及促进凋亡作用呈浓度和时间依耐性;Real-time PCR及免疫组化试验中显示,随着原花青素浓度的增加,Bcl-2mRNA及相应蛋白表达逐渐减少,Bax mRNA和相关蛋白表达逐渐增加。因此,原花青素对人胃癌SGC-7901细胞具有明显的抑制作用,其作用机制可能与上调Bcl-2蛋白和下调Bax蛋白水平有关。     

桦木酸对人胃癌SGC-7901细胞增殖的影响*

目的:利用不同浓度的桦木酸对人胃癌SGC-7901细胞增殖的影响。方法:桦木酸设4个不同浓度(0、10、20、30 μg/ml),并采用常规化疗药物5-Fu处理作为阳性对照,以探究其对细胞增殖的影响。采用台盼蓝拒染法和吉姆萨染色法分别检测桦木酸对人胃癌SGC-7901细胞生长抑制率及克隆形成率;EdU法检测SGC-7901的细胞增殖;利用流式细胞术检测细胞周期, 应用qRT-PCR和Western blot分别检测细胞周期蛋白cyclin D1,cyclin B1的mRNA和蛋白表达水平。结果:不同浓度的桦木酸处理人胃癌SGC-7901细胞48 h后,其细胞生长抑制率显著升高(P＜0.05),克隆形成率和细胞增殖率均明显降低(P＜0.01),且呈剂量和时间依赖性;人胃癌SGC-7901细胞被阻滞在G1/G0期,细胞周期蛋白cyclin D1和cyclin B1的mRNA和蛋白表达量也随桦木酸浓度升高而显著降低(P＜0.01)。且与5-Fu对照组相比,桦木酸浓度为20 μg/ml和30 μg/ml时,细胞增殖能力明显降低,细胞周期被抑制,细胞周期蛋白表达量均明显降低(P ＜0.05)。结论:桦木酸通过下调cyclin B1和cyclin D1基因表达,将人胃癌SGC-7901细胞阻滞在G1/G0期,从而抑制细胞增殖。     

莪术油诱导人胃腺癌SGC-7901细胞凋亡的研究

该实验目的是探究莪术油(zedoray turmeric oil,ZTO)诱导人胃腺癌SGC-7901细胞凋亡的作用。不同浓度的ZTO作用人胃腺癌SGC-7901细胞48 h后,采用台盼兰拒染法检测细胞生长抑制率;光学显微镜、荧光显微镜、透射电镜下观察细胞的形态和超微结构;琼脂糖凝胶电泳检测DNA片段化;Annexin V-FITC法检测细胞的凋亡率;实时荧光定量PCR和Western blot检测Bax、Bcl-2 m RNA和蛋白表达水平。结果显示,作用人胃腺癌SGC-7901细胞48 h,ZTO的最佳浓度是110μg/m L,IC50为(108.002±0.305)μg/m L;显微镜下细胞呈不同程度的凋亡特征;DNA电泳可见梯状条带;最佳药物浓度作用细胞48 h的早期凋亡率为(25.07±0.82)%;Bax表达水平升高,Bcl-2表达水平降低,Bax/Bcl-2比值显著升高(P0.05),表明ZTO通过上调Bax表达、下调Bcl-2表达诱导人胃腺癌SGC-7901细胞凋亡。     

紫檀茋诱导人胃癌SGC-7901细胞凋亡

该文主要研究不同浓度紫檀对人胃癌SGC-7901细胞增殖和凋亡的影响并分析细胞凋亡的可能机制。用不同浓度紫檀作用人胃癌SGC-7901细胞48 h后,通过MTT法检测细胞活性,荧光显微镜下观察细胞形态变化,流式细胞术检测细胞凋亡率和细胞周期,qRT-PCR和Western blot检测bax(B-cell lymphoma-2 associated X)及bcl-2(B-cell lymphoma-2)m RNA和蛋白表达水平。结果显示,紫檀处理细胞48 h的IC_(50)值为53.44μg/m L,显微镜下可观察到明显凋亡现象,随着药物浓度的增加早期凋亡和晚期凋亡所占百分比均不断增加,细胞阻滞于G1期,bcl-2基因表达下降,bax基因表达增加。综上所述,在一定浓度范围内,紫檀能抑制人胃癌SGC-7901细胞增殖,诱导细胞凋亡,呈剂量依赖性,并可上调bax基因表达,下调bcl-2基因表达。     

金雀异黄素合成品诱导人胃癌细胞SGC-7901凋亡的体外研究

目的:探讨金雀异黄素合成品诱导人胃癌细胞SGC-7901凋亡的作用机制。方法:采用2.5mg·L~(-1)、5.0mg·L~(-1)、10.0mg·L~(-1)和20.0mg·L~(-1)的金雀异黄素处理人胃癌细胞SGC-7901后,用流式细胞仪检测细胞凋亡率,电镜下观察细胞形态变化,RT-PCR法检测凋亡相关基因表达。结果:10.0mg·L~(-1),20.0mg·L~(-1)金雀异黄素能诱导胃癌细胞SGC-7901凋亡,凋亡率与剂量正相关(相关系数r=0.9830),10.0mg·L~(-1)金雀异黄素诱导胃癌细胞SGC-7901发生凋亡的形态学改变,2.5mg·L~(-1)、5.0mg·L~(-1)、10.0mg·L~(-1)和20.0mg·L~(-1)金雀异黄素使Bcl-2mRNA表达下调,Fas mRNA表达上调。结论:金雀异黄素能诱导胃癌细胞SGC-7901凋亡,降低Bcl-2 mRNA表达,增加Fas mRNA表达为其诱发SGC-7901细胞凋亡的机制之一。     

白术抑制胃癌细胞SGC-7901增殖并促进其凋亡

目的观察白术对胃癌SGC-7901侧群细胞及非侧群细胞增殖及凋亡的影响。方法流式细胞仪分选SGC-7901中的侧群细胞;制备含白术药物血清;CCK-8法检测白术药物血清对细胞增殖能力的影响;流式细胞仪检测含白术药物血清对细胞凋亡的影响;Western blot检测药物血清对细胞中Bax及Bcl-2蛋白表达的影响;异种移植BALB/C小鼠成瘤实验观察白术对细胞体内成瘤能力影响;免疫组织化学检测白术对小鼠肿瘤组织中Bax及Bcl-2蛋白表达的影响。结果离体实验表明,含白术药物血清培养可明显降低SGC-7901侧群细胞的增殖率,同时可诱导其凋亡、分别上调和下调细胞中Bax和Bcl-2水平;在体实验显示,白术汤剂灌胃可显著抑制SGC-7901侧群细胞小鼠成瘤能力,分别上调和下调肿瘤组织中Bax和Bcl-2水平。非侧群细胞也有上述表现。结论白术可通过上调促凋亡蛋白Bax及下调抑凋亡蛋白Bcl-2从而促进胃癌SGC-7901侧群细胞及非侧群细胞凋亡,并抑制其增殖及体内成瘤能力。     

二烯丙基二硫对人白血病K562细胞增殖及Bcl-2表达的影响

目的:探讨二烯丙基二硫(DADS)对白血病K562细胞增殖的影响,以及Bcl-2表达的调节作用.方法:用DADS预处理白血病K562细胞构建细胞模型,MTT法分别检测不同DADS浓度(5 gmL-1、10 g mL-1、20 g mL-1、40 g mL-1)和不同处理时间(6h、12h、24h、48h)细胞增殖情况,IC50浓度处理白血病K562细胞之后,Western blot和RT-PCR检测Bcl-2蛋白和mRNA表达水平.结果:MTT结果显示DADS能够抑制白血病K562细胞的增殖,且呈剂量和时间依赖性;IC50浓度的DADS处理K562细胞24小时后,Bcl-2蛋白和mRNA的表达量显著减少.结论:DADS可显著抑制K562细胞增殖,而这一作用可能与Bcl-2表达下调有关.     

Uniform straw-like cell architecture for three-dimensional cell–cell communication assay

ABSTRACT

We fabricated uniform straw-like cell architecture with central lumen using a suture thread within 1 h. The architecture consisting of cancer cells and mature adipocyte was used for cell–cell communication assay, although mature adipocyte could not form spontaneous multi-cellular spheroids. Using the system, it is possible to investigate three-dimensional cell–cell communication as an alternative to animal experiments.     

Programmed cell death in cell cultures

In plants most instances of programmed cell death (PCD) occur in a number of related, or neighbouring, cells in specific tissues. However, recent research with plant cell cultures has demonstrated that PCD can be induced in single cells. The uniformity, accessibility and reduced complexity of cell cultures make them ideal research tools to investigate the regulation of PCD in plants. PCD has now been induced in cell cultures from a wide range of species including many of the so-called model species. We will discuss the establishment of cell cultures, the fractionation of single cells and isolation of protoplasts, and consider the characteristic features of PCD in cultured cells. We will review the wide range of methods to induce cell death in cell cultures ranging from abiotic stress, absence of survival signals, manipulation of signal pathway intermediates, through the induction of defence-related PCD and developmentally induced cell death.     

A transitional cell carcinoma cell line

Summary A transitional cell carcinoma cell line, COLO 232, was derived from a primary urinary bladder tumor in a Caucasian male. In culture, COLO 232 retained distinct uroepithelial phenotypic traits and produced both carcinoembryonic antigen and adrenocorticotropic hormone. COLO 232 had a chromosome mode of 58 and retained the X and Y chromosomes. Ten marker chromosomes were identified. COLO 232 will be of value for biochemical and immunological studies. Presented in part at the 28th Annual Meeting of the Tissue Culture Association, June 7, 1977. This work was supported by Grant No. CA 15018 awarded by the National Cancer Institute, DHEW, and the Mary B. and L. H. Marshall Fund.     

Germ cell sex and cell cycle

Germ cells are the only cells in the body capable of transferring an individual's genetic and epigenetic information to the next generation. However, the developmental processes that provide the foundation for male and female germ line development and later gamete production are complex and poorly understood. In mice the primordial germ cells enter the bipotential gonad at E10.5 and, in response to the testicular or ovarian micro-environment, commit to spermatogenesis or oogenesis. This paper reviews progress in understanding the molecular processes underlying the early stages of male and female germ line development.     

Preformed cell structure and cell heredity

This review will first recall the phenomena of “cortical inheritance” observed and genetically demonstrated in Paramecium 40 years ago, and later in other ciliates (Tetrahymena, Oxytricha, Paraurostyla), and will analyze the deduced concept of “cytotaxis” or “structural memory.” The significance of these phenomena, all related (but not strictly restricted) to the properties of ciliary basal bodies and their mode of duplication, will be interpreted in the light of present knowledge on the mechanism and control of basal body/centriole duplication. Then other phenomena described in a variety of organisms will be analyzed or mentioned which show the relevance of the concept of cytotaxis to other cellular processes, mainly (1) cytoskeleton assembly and organization with examples on ciliates, trypanosome, mammalian cells and plants, and (2) transmission of polarities with examples on yeast, trypanosome and metazoa. Finally, I will discuss some aspects of this particular type of non-DNA inheritance: (1) why so few documented examples if structural memory is a basic parameter in cell heredity, and (2) how are these phenomena (which all rely on protein/protein interactions, and imply a formatting role of preexisting proteinic complexes on neo-formed proteins and their assembly) related to prions?Key words: Paramecium, basal-body, centriole, basal-body duplication, cell polarity, structural inheritance, cytotaxis, cell memory, epigenetics     

Electrostimulated cell fusion in cell engineering

A survey of studies on reconstructions of animal and plant cells which apply a new physical method--electrostimulated fusion, is presented. Effects of different factors of the medium on the efficiency of electrofusion is discussed. A detailed account is given of the authors' studies on zygotes reconstruction by combined methods of microsurgery and electrostimulated cell fusion. Advantages of the latter as compared to the widely distributed methods of fusion by polyethylenglycol and Sendai virus are considered. This physical method can play an important role in the progress of cellular engineering.